Doc, which played the Tribeca Film Festival, examines the work of Toback, the scribe behind pics including “Bugsy” and “The Gambler,” who’s known for his unorthodox working style and larger-than-life persona.

Jarecki shot the auteur on the set of “When Will I Be Loved,” an indie project with Neve Campbell and Dominic Chianese that Toback famously filmed in 12 days with no script.

Also featured in the doc are industry figures including Woody Allen and Robert Downey Jr. commenting on the director, as well as stories about Toback’s hard living with the likes of NFL great Jim Brown.

“The reason (Toback) is able to work in such a crazy way and not be a jumbled mess is because so many of the movies are about him,” Jarecki said. ” ‘The Gambler’ is actually based on his life.”

Jarecki comes from a family of documentary filmmakers: brother Andrew Jarecki directed HBO doc “Capturing the Friedmans,” while another brother, Eugene Jarecki, helmed “Why We Fight,” the Sony Pictures Classics release about U.S. foreign policy.

Jarecki came to know Toback researching his book “Breaking In: How 20 Film Directors Got Their Start,” which Doubleday released in 2002.